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DaddyGlenn's Avatar
 
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Rear defrost switch rating?

I am thinking about re-purposing the rear window defroster switch in my 1985.1 944 track car. If it can handle it, I will use it to direct wire the radiator fans.

Does anyone know how much amperage this guy can handle?
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Glenn
Daily Driver - '78 911SC RoW, Track - '85.1 944
Wife's - '00 740iL (Sport),
Support vehicle - '00 Suburban 2500 4x4
Son's - '85.1 944
Old 08-31-2018, 05:36 PM
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How many amps is the fuse that switch is on? I would assume that's how much it can handle.
Old 08-31-2018, 05:41 PM
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Quote:
Originally Posted by drkshdw View Post
How many amps is the fuse that switch is on? I would assume that's how much it can handle.
Calling me out for being lazy, huh? I see how it is. Just kidding.

Really that is a no-brainer. I should have thought of that, but didn't. Thank you. And now that you suggest it ... the wiring diagrams say 8 amps, which is too little. I need at least 25. But, hey, the relay is 25 amps. So I could relocate the relay and use that to carry the load of the fans.

I'll have to see how much work that would be.
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Glenn
Daily Driver - '78 911SC RoW, Track - '85.1 944
Wife's - '00 740iL (Sport),
Support vehicle - '00 Suburban 2500 4x4
Son's - '85.1 944
Old 08-31-2018, 05:59 PM
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HAHA!!! Sometimes the most obvious isn't the most obvious at the time.

Now as far as running the fans through the relay, I have no idea how you'd go about doing that. There are plenty of racers that direct wire the fans but I don't know how or where they get power or control them. Perhaps a search in the turbo forum would yield some more clues than just here.
Old 08-31-2018, 06:41 PM
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I did do my research for how to direct wire the fans. It seems the popular method is to run a wire from the ground wire for each fan to a switch and then ground. I am looking for a more elegant solution. I've located where I can tap into existing wiring under the dash. Just need a good switch or switch/relay solution.

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Glenn
Daily Driver - '78 911SC RoW, Track - '85.1 944
Wife's - '00 740iL (Sport),
Support vehicle - '00 Suburban 2500 4x4
Son's - '85.1 944
Old 09-02-2018, 05:46 AM
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Use a relay, it's easier and safer.

Then you can use any switch on the dash you want.
Old 09-02-2018, 06:39 AM
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